ttyplot

a realtime plotting utility for terminal with data input from stdin

takes data from standard input, most commonly unix pipeline and plots in text mode on a terminal or console, for example ping:

   

supports rate calculation for counters and up to two graphs on a single display using reverse video for second line, for example snmpget:

   

usage examples

cpu usage from vmstat using awk to pick the right column

vmstat -n 1 | gawk '{ print 100-int($(NF-2)); fflush(); }' | ttyplot 

cpu usage from sar with title and fixed scale to 100%

sar 1 | gawk '{ print 100-int($NF); fflush(); }' | ttyplot -s 100 -t "cpu usage" -u "%"

memory usage from sar, using perl to pick the right column

sar -r 1 | perl -lane 'BEGIN{$|=1} print "@F[5]"' | ttyplot -s 100 -t "memory used %" -u "%" 

number of processes in running and io blocked state

vmstat -n 1 | perl -lane 'BEGIN{$|=1} print "@F[0,1]"' | ttyplot -2 -t "procs in R and D state"

ping plot with sed

ping 8.8.8.8 | sed -u 's/^.*time=//g; s/ ms//g' | ttyplot -t "ping to 8.8.8.8" -u ms

wifi signal level in -dBM (higher is worse)

{ while true; do iwconfig 2>/dev/null | grep "Signal level" | sed -u 's/^.*Signal level=-//g; s/dBm//g'; sleep 1; done } | ttyplot -t "wifi signal" -u "-dBm" -s 90

cpu temperature from proc

{ while true; do awk '{ printf("%.1f\n", $1/1000) }' /sys/class/thermal/thermal_zone0/temp; sleep 1; done } | ttyplot -t "cpu temp" -u C

fan speed from lm-sensors using grep, tr and cut

{ while true; do sensors | grep fan1: | tr -s " " | cut -d" " -f2; sleep 1; done } | ttyplot -t "fan speed" -u RPM

bitcoin price chart using cut

{ while true; do curl -sL https://coinbase.com/api/v1/prices/historical | head -1 | cut -d, -f2 ; sleep 600; done } | ttyplot -t "bitcoin price" -u usd

stock quote chart

{ while true; do curl -s https://api.iextrading.com/1.0/stock/googl/price; echo; sleep 600; done } | ttyplot -t "google stock price" -u usd

prometheus load average via node exporter

{ while true; do curl -s  http://10.4.7.180:9100/metrics | grep "^node_load1 " | cut -d" " -f2; sleep 1; done } | ttyplot

   

network/disk throughput examples

ttyplot supports two line plot for in/out or read/write

local network throughput for all interfaces combined from sar

sar  -n DEV 1 | gawk '{ if($6 ~ /rxkB/) { print iin/1000; print out/1000; iin=0; out=0; fflush(); } iin=iin+$6; out=out+$7; }' | ttyplot -2 -u "MB/s"

snmp network throughput for an interface using ttg

ttg -i 10 -u Mb 10.23.73.254 public 9 | gawk '{ print $5,$8; fflush(); }' | ttyplot -2 -u Mb/s

snmp network throughput for an interface using snmpdelta

snmpdelta -v 2c -c public -Cp 10 10.23.73.254 1.3.6.1.2.1.2.2.1.{10,16}.9 | gawk '{ print $NF/1000/1000/10; fflush(); }' | ttyplot -2 -t "interface 9 throughput" -u Mb/s

disk throughput from iostat

iostat -xmy 1 nvme0n1 | stdbuf -o0 tr -s " " | stdbuf -o0 cut -d " " -f 4,5 | ttyplot -2 -t "nvme0n1 throughput" -u MB/s

   

rate calculator for counters

ttyplot supports "counter" style metrics, calculating "rate" by measured time difference between samples

snmp network throughput for an interface using snmpget

{ while true; do snmpget  -v 2c -c public  10.23.73.254  1.3.6.1.2.1.2.2.1.{10,16}.9 | awk '{ print $NF/1000/1000; }'; sleep 10; done } | ttyplot -2 -r -u "MB/s"

prometheus node exporter disk throughput for sda device

{ while true; do curl -s http://10.11.0.173:9100/metrics | awk '/^node_disk_.+_bytes_total{device="sda"}/ { printf("%f\n", $2/1024/1024); }'; sleep 1; done } | ttyplot -r -2 -u MB/s -t "10.11.0.173 sda writes"

   

options

ttyplot [-r] [-c plotchar] [-s softmax] [-m hardmax] [-t title] [-u unit]

-2 read two values and draw two plots, the second one is in reverse video

-r calculate counter rate and divide by measured sample interval

-c character to use for plot line, eg @ # % . etc

-s softmax is an initial maximum value that can grow if data input has larger value

-m hardmax is a hard maximum value that can never grow, 
   if data input has larger value the plot line will not be drawn

-t title of the plot

-u unit displayed beside vertical bar

   

stdio buffering

by default stdio is buffered, you can work around it in various ways